<style>
	.block {
	  position: absolute;
	  left: 0;
	  top: 0;
	}
	
	.sliderContainer {
	  position: relative;
	  text-align: center;
	  width: 310px;
	  height: 40px;
	  line-height: 40px;
	  margin-top: 15px;
	  background: #f7f9fa;
	  color: #45494c;
	  border: 1px solid #e4e7eb;
	}
	
	.sliderContainer_active .slider {
	  height: 38px;
	  top: -1px;
	  border: 1px solid #1991FA;
	}
	
	.sliderContainer_active .sliderMask {
	  height: 38px;
	  border-width: 1px;
	}
	
	.sliderContainer_success .slider {
	  height: 38px;
	  top: -1px;
	  border: 1px solid #52CCBA;
	  background-color: #52CCBA !important;
	}
	
	.sliderContainer_success .sliderMask {
	  height: 38px;
	  border: 1px solid #52CCBA;
	  background-color: #D2F4EF;
	}
	
	.sliderContainer_success .sliderIcon {
	  background-position: 0 0 !important;
	}
	
	.sliderContainer_fail .slider {
	  height: 38px;
	  top: -1px;
	  border: 1px solid #f57a7a;
	  background-color: #f57a7a !important;
	}
	
	.sliderContainer_fail .sliderMask {
	  height: 38px;
	  border: 1px solid #f57a7a;
	  background-color: #fce1e1;
	}
	
	.sliderContainer_fail .sliderIcon {
	  background-position: 0 -83px !important;
	}
	.sliderContainer_active .sliderText, .sliderContainer_success .sliderText, .sliderContainer_fail .sliderText {
	  display: none;
	}
	
	.sliderMask {
	  position: absolute;
	  left: 0;
	  top: 0;
	  height: 40px;
	  border: 0 solid #1991FA;
	  background: #D1E9FE;
	}
	
	.slider {
	  position: absolute;
	  top: 0;
	  left: 0;
	  width: 40px;
	  height: 40px;
	  background: #fff;
	  box-shadow: 0 0 3px rgba(0, 0, 0, 0.3);
	  cursor: pointer;
	  transition: background .2s linear;
	}
	
	.slider:hover {
	  background: #1991FA;
	}
	
	.slider:hover .sliderIcon {
	  background-position: 0 -13px;
	}
	
	.sliderIcon {
	  position: absolute;
	  top: 15px;
	  left: 13px;
	  width: 14px;
	  height: 10px;
	  background: url(../img/icon_light.f13cff3.png) 0 -26px;
	  background-size: 34px 471px;
	}
	
	.refreshIcon {
	  position: absolute;
	  right: 0;
	  top: 0;
	  width: 34px;
	  height: 34px;
	  cursor: pointer;
	  background: url(../img/icon_light.f13cff3.png) 0 -437px;
	  background-size: 34px 471px;
	}

</style>
<style>
.container {
  width: 310px;
  margin: 100px auto;
}
input {
  display: block;
  width: 290px;
  line-height: 40px;
  margin: 10px 0;
  padding: 0 10px;
  outline: none;
  border:1px solid #c8cccf;
  border-radius: 4px;
  color:#6a6f77;
}
#msg {
  width: 100%;
  line-height: 40px;
  font-size: 14px;
  text-align: center;
}
a:link,a:visited,a:hover,a:active {
  margin-left: 100px;
  color: #0366D6;
}
</style>
<div class="container">
	<span style="width: 310px;height: 50px;font-size: 20px;text-align: center;line-height: 50px;background: #009688;color: #fff;display: inline-block;border-radius: 10px 10px 0px 0px;">YIX注册验证<i class="layui-icon">&#xe714;</i></span>
	<div id="captcha" style="position: relative"></div>
	<div id="msg"></div>
</div>
<script>
	(function (window) {
	  const l = 42, // 滑块边长
	    r = 10, // 滑块半径
	    w = 310, // canvas宽度
	    h = 155, // canvas高度
	    PI = Math.PI
	  const L = l + r * 2 // 滑块实际边长
	
	  function getRandomNumberByRange(start, end) {
	    return Math.round(Math.random() * (end - start) + start)
	  }
	
	  function createCanvas(width, height) {
	    const canvas = createElement('canvas')
	    canvas.width = width
	    canvas.height = height
	    return canvas
	  }
	
	  function createImg(onload) {
	    const img = createElement('img')
	    img.crossOrigin = "Anonymous"
	    img.onload = onload
	    img.onerror = () => {
	      img.src = getRandomImg()
	    }
	    img.src = getRandomImg()
	    return img
	  }
	  
	  function createElement(tagName) {
	    return document.createElement(tagName)
	  }
	
	  function addClass(tag, className) {
	    tag.classList.add(className)
	  }
	
	  function removeClass(tag, className) {
	    tag.classList.remove(className)
	  }
	  
	  function getRandomImg() {
	    return 'https://picsum.photos/300/150/?image=' + getRandomNumberByRange(0, 100)
	  }
	
	  function draw(ctx, operation, x, y) {
	    ctx.beginPath()
	    ctx.moveTo(x, y)
	    ctx.lineTo(x + l / 2, y)
	    ctx.arc(x + l / 2, y - r + 2, r, 0, 2 * PI)
	    ctx.lineTo(x + l / 2, y)
	    ctx.lineTo(x + l, y)
	    ctx.lineTo(x + l, y + l / 2)
	    ctx.arc(x + l + r - 2, y + l / 2, r, 0, 2 * PI)
	    ctx.lineTo(x + l, y + l / 2)
	    ctx.lineTo(x + l, y + l)
	    ctx.lineTo(x, y + l)
	    ctx.lineTo(x, y)
	    ctx.fillStyle = '#fff'
	    ctx[operation]()
	    ctx.beginPath()
	    ctx.arc(x, y + l / 2, r, 1.5 * PI, 0.5 * PI)
	    ctx.globalCompositeOperation = "xor"
	    ctx.fill()
	  }
	
	  function sum(x, y) {
	    return x + y
	  }
	
	  function square(x) {
	    return x * x
	  }
	
	  class jigsaw {
	    constructor(el, success, fail) {
	      this.el = el
	      this.success = success
	      this.fail = fail
	    }
	
	    init() {
	      this.initDOM()
	      this.initImg()
	      this.draw()
	      this.bindEvents()
	    }
	
	    initDOM() {
	      const canvas = createCanvas(w, h) // 画布
	      const block = canvas.cloneNode(true) // 滑块
	      const sliderContainer = createElement('div')
	      const refreshIcon = createElement('div')
	      const sliderMask = createElement('div')
	      const slider = createElement('div')
	      const sliderIcon = createElement('span')
	      const text = createElement('span')
	
	      block.className = 'block'
	      sliderContainer.className = 'sliderContainer'
	      refreshIcon.className = 'refreshIcon'
	      sliderMask.className = 'sliderMask'
	      slider.className = 'slider'
	      sliderIcon.className = 'sliderIcon'
	      text.innerHTML = '向右滑动滑块填充拼图'
	      text.className = 'sliderText'
	
	      const el = this.el
	      el.appendChild(canvas)
	      el.appendChild(refreshIcon)
	      el.appendChild(block)
	      slider.appendChild(sliderIcon)
	      sliderMask.appendChild(slider)
	      sliderContainer.appendChild(sliderMask)
	      sliderContainer.appendChild(text)
	      el.appendChild(sliderContainer)
	
	      Object.assign(this, {
	        canvas,
	        block,
	        sliderContainer,
	        refreshIcon,
	        slider,
	        sliderMask,
	        sliderIcon,
	        text,
	        canvasCtx: canvas.getContext('2d'),
	        blockCtx: block.getContext('2d')
	      })
	    }
	
	    initImg() {
	      const img = createImg(() => {
	        this.canvasCtx.drawImage(img, 0, 0, w, h)
	        this.blockCtx.drawImage(img, 0, 0, w, h)
	        const y = this.y - r * 2 + 2
	        const ImageData = this.blockCtx.getImageData(this.x, y, L, L)
	        this.block.width = L
	        this.blockCtx.putImageData(ImageData, 0, y)
	      })
	      this.img = img
	    }
	
	    draw() {
	      // 随机创建滑块的位置
	      this.x = getRandomNumberByRange(L + 10, w - (L + 10))
	      this.y = getRandomNumberByRange(10 + r * 2, h - (L + 10))
	      draw(this.canvasCtx, 'fill', this.x, this.y)
	      draw(this.blockCtx, 'clip', this.x, this.y)
	    }
	
	    clean() {
	      this.canvasCtx.clearRect(0, 0, w, h)
	      this.blockCtx.clearRect(0, 0, w, h)
	      this.block.width = w
	    }
	
	    bindEvents() {
	      this.el.onselectstart = () => false
	      this.refreshIcon.onclick = () => {
	        this.reset()
	      }
	
	      let originX, originY, trail = [], isMouseDown = false
	      this.slider.addEventListener('mousedown', function (e) {
	        originX = e.x, originY = e.y
	        isMouseDown = true
	      })
	      document.addEventListener('mousemove', (e) => {
	        if (!isMouseDown) return false
	        const moveX = e.x - originX
	        const moveY = e.y - originY
	        if (moveX < 0 || moveX + 38 >= w) return false
	        this.slider.style.left = moveX + 'px'
	        var blockLeft = (w - 40 - 20) / (w - 40) * moveX
	        this.block.style.left = blockLeft + 'px'
	
	        addClass(this.sliderContainer, 'sliderContainer_active')
	        this.sliderMask.style.width = moveX + 'px'
	        trail.push(moveY)
	      })
	      document.addEventListener('mouseup', (e) => {
	        if (!isMouseDown) return false
	        isMouseDown = false
	        if (e.x == originX) return false
	        removeClass(this.sliderContainer, 'sliderContainer_active')
	        this.trail = trail
	        const {spliced, TuringTest} = this.verify()
	        if (spliced) {
	          if (TuringTest) {
	            addClass(this.sliderContainer, 'sliderContainer_success')
	            this.success && this.success()
	          } else {
	            addClass(this.sliderContainer, 'sliderContainer_fail')
	            this.text.innerHTML = '再试一次'
	            this.reset()
	          }
	        } else {
	          addClass(this.sliderContainer, 'sliderContainer_fail')
	          this.fail && this.fail()
	          setTimeout(() => {
	            this.reset()
	          }, 1000)
	        }
	      })
	    }
	
	    verify() {
	      const arr = this.trail // 拖动时y轴的移动距离
	      const average = arr.reduce(sum) / arr.length // 平均值
	      const deviations = arr.map(x => x - average) // 偏差数组
	      const stddev = Math.sqrt(deviations.map(square).reduce(sum) / arr.length) // 标准差
	      const left = parseInt(this.block.style.left)
	      return {
	        spliced: Math.abs(left - this.x) < 10,
	        TuringTest: average !== stddev, // 只是简单的验证拖动轨迹，相等时一般为0，表示可能非人为操作
	      }
	    }
	
	    reset() {
	      this.sliderContainer.className = 'sliderContainer'
	      this.slider.style.left = 0
	      this.block.style.left = 0
	      this.sliderMask.style.width = 0
	      this.clean()
	      this.img.src = getRandomImg()
	      this.draw()
	    }
	
	  }
	
	  window.jigsaw = {
	    init: function (element, success, fail) {
	      new jigsaw(element, success, fail).init()
	    }
	  }
	}(window))
</script>
<script type="text/javascript">
jigsaw.init(document.getElementById('captcha'), function () {
	layui.use('layer', function() {
		var layer = layui.layer;
		layer.msg("验证成功");
	});
})
</script>
